16720789 has 2 divisors, whose sum is σ = 16720790. Its totient is φ = 16720788.

The previous prime is 16720699. The next prime is 16720813. The reversal of 16720789 is 98702761.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10048900 + 6671889 = 3170^2 + 2583^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16720789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16720289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8360394 + 8360395.

It is an arithmetic number, because the mean of its divisors is an integer number (8360395).

Almost surely, 2^16720789 is an apocalyptic number.

It is an amenable number.

16720789 is a deficient number, since it is larger than the sum of its proper divisors (1).

16720789 is an equidigital number, since it uses as much as digits as its factorization.

16720789 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 42336, while the sum is 40.

The square root of 16720789 is about 4089.1061370427. The cubic root of 16720789 is about 255.7126750743.

The spelling of 16720789 in words is "sixteen million, seven hundred twenty thousand, seven hundred eighty-nine".